The WSTK contract service is used to establish whether the userof a service has a valid contract in place, the contract identifier is then referenced on the meter records.
WSTK合同服务用来确定服务的用户是否拥有一个有效的合同,之后合同标识符将在评测记录中被引用。
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How does the userof the service find and access this service?